[gtk] (28 commits) Non-fast-forward update to branch matthiasc/for-master

[Matthias Clasen <matthiasc src gnome org>]

The branch 'matthiasc/for-master' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  09b3fc9... Fix build with recent Vulkan versions

Commits added to the branch:

  3c24841... vulkancontext: Remove usage of VK_ERROR_INCOMPATIBLE_VERSIO (*)
  f816a8f... gl renderer: Unify viewport setting in add_offscreen_ops() (*)
  7f6608c... gl renderer: Render too big textures to the clipped area (*)
  7eece7e... gl renderer: Take a out graphene_rect in blur_node() (*)
  02f0681... settings: Change gtk-cursor-aspect-ratio from float to doub (*)
  db08bcc... Merge branch 'cursor-aspect-ratio' into 'master' (*)
  addcf57... Adwaita: flat button adjustments (*)
  4f12e2f... Fix URLs for the download.gnome.org locations (*)
  8a923e0... Merge branch 'wip/jimmac/flat-button-tweaks' into 'master' (*)
  e9e09be... Merge branch 'issue-3483' into 'master' (*)
  1738724... Notify properties on deletion in PasswordEntryBuffer (*)
  e71f6b0... docs: Note the caveat on GtkEditable signals with delegates (*)
  af0973c... a11y: Fix removing mnemonic widgets (*)
  ec94ec0... Merge branch 'ebassi/password-entry-notify' into 'master' (*)
  a5365ec... docs: Add missing GTK types (*)
  bf4c3dc... docs: Fix list of kinds of shortcuts in Keyboard input (*)
  3f56e81... Merge branch 'shortcuts' into 'master' (*)
  2da8d9b... Do not build gdk-pixbuf's man page (*)
  d330627... Merge branch 'ebassi/docs-for-master' into 'master' (*)
  f31765d... Merge branch 'ebassi/mnemonic-label-remove' into 'master' (*)
  7533369... Merge branch 'wip/baedert/for-master' into 'master' (*)
  9521f60... docs: backtick fixes (*)
  0c6a6b3... Merge branch 'doc_backticks' into 'master' (*)
  14bf45a... 3to4: Remove GtkCheckButton:draw-indicator (*)
  f2b1683... 3to4: Add test for GtkCheckButton:draw-indicator removal (*)
  3e319b4... Merge branch 'ebassi/issue-3492' into 'master' (*)
  12611fa... Revert "gl renderer: Take a out graphene_rect in blur_node(
  d5143a1... Revert "gl renderer: Render too big textures to the clipped

(*) This commit already existed in another branch; no separate mail sent